Anthem.NET

I have a mutilple anthem panels,and within that mutiple anthem image
buttons which behave like checkboxes...But it happens that whne i randomly
click on any of trhe image buttons,some time the OnCommand event of the
image button doesnt fire at all.Here is my code :
<anthem:DataList ID="dtlstWidth" runat="server" EnableCallBack="true">
<ItemTemplate>
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td style="width: 10px">
<anthem:Panel ID="pnlID" runat="server" EnableCallBack="true"
Width="3px" Height="3px">
<anthem:ImageButton ID="imgWidth" runat="server"
EnableCallBack="true" PreCallBackFunction="callback('divshowLoading')"
ImageUrl="~/Images/spacer.gif" Width="5px" Height="5px" BackColor="red"
BorderWidth="1px" OnCommand="ChooseThis" BorderColor="#52514F"
/></anthem:Panel>
</td>
<td>
<anthem:Label ID="lblName" runat="server" Text="color" />
</td>
</tr>
</table>
</ItemTemplate>
</anthem:DataList>
Please help me...its urgent!!